- Incorporated a rewording proposal by Jeff.

This commit was SVN r22670.

ompi/mca/common/sm/common_sm_mmap.c

@@ -10,7 +10,7 @@
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
  * Copyright (c) 2007      Sun Microsystems, Inc.  All rights reserved.
- * Copyright (c) 2008-2009 Cisco Systems, Inc.  All rights reserved.
+ * Copyright (c) 2008-2010 Cisco Systems, Inc.  All rights reserved.
  * $COPYRIGHT$
  * 
  * Additional copyrights may follow
@@ -225,7 +225,7 @@ mca_common_sm_mmap_t* mca_common_sm_mmap_init(ompi_proc_t **procs,
         /* Check, whether the specified filename is on a network file system */
         if (opal_path_nfs(file_name)) {
             orte_show_help("help-mpi-common-sm.txt", "mmap on nfs", 1,
-                           file_name);
+                           orte_process_info.nodename, file_name);
         }
         /* process initializing the file */
         fd = open(file_name, O_CREAT|O_RDWR, 0600);

ompi/mca/common/sm/help-mpi-common-sm.txt

@@ -1,6 +1,6 @@
 # -*- text -*-
 #
-# Copyright (c) 2009 Cisco Systems, Inc.  All rights reserved.
+# Copyright (c) 2009-2010 Cisco Systems, Inc.  All rights reserved.
 #
 # $COPYRIGHT$
 # 
@@ -29,14 +29,23 @@ Open MPI, and if not, contact the Open MPI developers.
   Requested size:    %ul
   Control seg size:  %ul
   Data seg aligment: %ul
-
+#
 [mmap on nfs]
+WARNING: Open MPI will create a shared memory backing file in a
+directory that appears to be mounted on a network filesystem. 
 Creating the shared memory backup file on a network file system, such
-as NFS or Lustre is not recommended.
-This may be due to using the wrong tmpdir variable.
-Please ask Your system administrator to provide a system-wide MCA
-parameter file, in which parameter orte_no_session_dir is specified:
-It states paths of directories, not allowed as session directories.
+as NFS or Lustre is not recommended -- it may cause excessive network
+traffic to your file servers and/or cause shared memory traffic in
+Open MPI to be much slower than expected.
 
-  File Name:        %s
+You may want to check your compute nodes, what the typical temporari
+directory: node.  Possible sources of the location of this temporary
+directory include the $TEMPDIR, $TEMP, and $TMP environment variables.
+
+Note, too, that system administrators can set a list of filesystems
+where Open MPI is disallowed from creating temporary files by settings
+the MCA parameter "orte_no_session_dir".
+
+  Local host: %s
+  File Name:  %s